Attempted relative import with no known parent package
To the future me if I make more addons and to newer programmers when it comes to blender, the issue isn't actually the scripts at all. Blenders in-house text editor cannot edit multi file addons, if you try it will throw this error. I was going insane trying to figure out what was wrong with my addon and comparing it to other code.
To conclude, if you're making a multi file addon, it'll work if the syntax is right and it's installed, and you can still edit it this way..